Pivot slips are passably good for separation, but the slipping aspect is too far removed from a good turn for me.
Pivot slips are good for separation, fore/aft balance, edge control, simultaneous release of skis, etc.
But where they are really good is for getting through this steep, icy, scraped, sob pitch on the way home after a hard days skiing when you really don't wanna put in the effort trying to hold an edge for pete's sake legs are cooked. Hey, crew, great pitch for drills - pivot slips! And when we get down there (point to the pleasant mellow pitch below) how about some white pass turns? (Vain attempt to restore dignity...)